Season 6 of
"Sons of Anarchy" has added two more guest stars to a growing roster of familiar faces.

C. Thomas Howell, coming off the recently canceled "Southland," will play another law-enforcement type in a recurring part,
TVLine reports.
Steve Howey ("Shameless") will also guest in a couple of episodes as a fellow biker.

The two actors
join CCH Pounder,
Kim Dickens and
Bridget Regan on the guest list for the coming season, which will air in the fall.

Howell will play an ATF agent who is not the most by-the-book guy. Howey's character is a member of another Sons chapter who comes into contact with SAMCRO.